My 3-month-old baby is drinking less formula than normal, but seems to be gaining weight and has constipation. Why?

Q. What are the reasons for poor feeding in a 3-month-old baby with constipation issues?

Answered by
Dr. Bhaisara Baraturam Bhagrati
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on May 01, 2023

Hi doctor,

My baby is eating less formula than normal but seems to be gaining weight still at a good rate. She is three months old, and other than occasional constipation is perfectly healthy. Is there any reason why she has suddenly not been eating as much? She normally eats 4 to 5 oz, on demand of formula. Now she is snacking on 2 to 4 oz per feeding. And she feeds often.



Welcome to

I understand your concern.

If she is gaining weight, then that should not be a concern. Babies usually have various feeding patterns, and a lot of factor matters, like gastric emptying, feeding duration, gaps, etc. Often, overfeeding or indigestion can be a cause of decreased feeding, so just take care of it. Specifically in developing countries, iron deficiency at this particular age is an important cause of decreased feeding but will also present with not gaining weight over a period of time. I hope it is not the case with you. Still, I suggest you make sure the iron status is good.

Happy to serve you.

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